> ## Documentation Index
> Fetch the complete documentation index at: https://docs.polygon.technology/llms.txt
> Use this file to discover all available pages before exploring further.

# ERC721 with Matic.js on Polygon PoS

> POSClient provides erc721 method which helps you to interact with a erc721 token.

`POSClient` provides `erc721` method which helps you to interact with a erc721 token.

The method returns an object which has various methods.

```
const erc721token = posClient.erc721(<token address>,<isRoot>);
```

Passing second arguments for `isRoot` is optional.

## Child token

Token on polygon can be initiated by using this syntax -

```
const childERC20Token = posClient.erc721(<child token address>);
```

## Parent token

Token on ethereum can be initiated by providing second parameter value as `true`.

```
const parentERC20Token = posClient.erc721(<parent token address>, true);
```